330 Illinois State Laboratory of Natural History. 



the two ends and two lateral plates just back of the equa- 

 torial groove drawn out into horn-like processes, often much 

 longer than the width of the shell, usually the left process 

 not developed, so that there are but three in all ; the two 

 halves similar in size and texture, the anterior with six plates, 

 the posterior with four. 



58. C. hirundinella 0. F. MiJLL. 



A few individuals were noted in towings from the river and 

 Thompson's Lake in August and September of the second 

 year only. 



54, C. brevicorne Hempel ('96). 



A few were taken in the river channel at E in August and 

 September, also in each of six successive towings in Matan- 

 zas Lake in August. 



Class Ij^FUSOEIA. 



Subclass CILTATA. 



Order GYMNOSTOMATA. 



Family ENCHELIDiE. 



Subfamily HOLOPHRYIN^. 



Lacrymaria Ehrbg. 



A distinct circle of large cilia around the mouth ; body 

 narrowed anteriorly and more or less bottle-shaped, moder- 

 ately elastic. 



55. L. truncata Stokes ('85a). 



Taken only once, in a Birge-net collection amongst vege- 

 tation at the mouth of Dogfish Lake, in August. 



Subfamily COLEPIN^. 



COLEPS NiTZSCH. 



More or less barrel-shaped, axis slightly curved ; persistent 

 in shape ; covered with quadrangular plates in checker-board 

 arrangement, with intervening spaces in which arise rows of 



